Panasonic PV-V462 User manual

ORDERNO. MKE0201001C1
B3
VideoCassette Recorder
PV-V462 / PV-V4602 / PV-V4622 / PV-V4612S/ PV-V4022-K/
PV-V4522-K/ PV-V4612-K
SPECIFICATIONS
2002 Matsushita Kotobuki Electronics Industries Ltd. All rights

reserved. Unauthorizedcopying and distribution isaviolation of
law.
1. SAFETY PRECAUTIONS
GENERALGUIDELINES
1. IMPORTANTSAFETY NOTICE
Therearespecial components usedinthisequipmentwhichare
importantfor safety. These parts aremarkedbyinthe
SchematicDiagrams, CircuitBoard Layout, ExplodedViewsand
ReplacementParts List. Itisessential that these criticalparts
shouldbereplacedwithmanufacturer’sspecifiedparts toprevent
shock, fireor otherhazards. Donotmodifytheoriginal design
withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
servicing ofVCR whose chassisisnotisolatedfrom theAC
powerline. Use atransformerofadequate powerrating as this
protects thetechnicianfrom accidents resulting inpersonalinjury
from electrical shocks. Itwill alsoprotect VCR from being
damagedbyaccidental shorting that mayoccur during servicing.
3. Whenservicing, observetheoriginal leaddress. Ifashortcircuit
isfound, replace all parts whichhavebeenoverheatedor
damagedbytheshortcircuit.
4. Afterservicing, see toitthat all theprotectivedevices suchas
insulation barriers, insulation papersshieldsareproperly
installed.
5. Afterservicing, make thefollowing leakagecurrentchecks to
preventthecustomerfrom being exposedtoshock hazards.
LEAKAGECURRENTCOLD CHECK
1. Unplug theACcord and connect ajumperbetweenthetwo
prongson theplug.

2. Measuretheresistance value, withanohmmeter, betweenthe
jumperedACplug and eachexposedmetalliccabinet parton the
equipmentsuchas screwheads, connectors, control shafts, etc.
Whentheexposedmetallicparthas areturn pathtothechassis,
thereading shouldbebetween1M and 5.2M . Whenthe
exposedmetal does nothaveareturn pathtothechassis, the
reading must beinfinity.
LEAKAGECURRENTHOTCHECK
(See figure 1.)
1. Plug theACcord directlyintotheACoutlet. Donotuse an
isolation transformerfor thischeck.
2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 F
capacitor, betweeneachexposedmetallicparton theset and a
good earthground, as showninfigure1.
3. Use anACvoltmeter, with1k /V or moresensitivity, tomeasure
thepotential across theresistor.
4. Check eachexposedmetallicpart, and measurethevoltageat
eachpoint.
5. Reverse theACplug intheACoutlet and repeat eachoftheabove
measurements.
6. Thepotential at anypointshouldnotexceed0.75 V RMS. A
leakagecurrenttester(Simpson Model 229 or equivalent) maybe
usedtomake thehotchecks. Leakagecurrentmust notexceed1/
2mA. Incase ameasurementisoutsideofthelimits specified,
thereisapossibilityofashock hazard, and theequipmentshould
berepairedand recheckedbeforeitisreturnedtothecustomer.
Figure 1
2. PREVENTIONOF ELECTRO-STATICDISCHARGE

(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
Some semiconductor(solidstate)devices canbe damagedeasilybystatic electricity. Such
components commonlyare calledElectrostaticallySensitive (ES)Devices. Examples of typical
ES devices are integratedcircuits, some field-effecttransistorsand semiconductor"chip"
components. The following techniques shouldbe usedto helpreduce the incidence of
component damage causedbyelectrostatic discharge (ESD).
1. Immediatelybeforehandling anysemiconductor componentor
semiconductor-equippedassembly, drainoff anyESDon your
bodybytouching aknownearthground. Alternatively, obtainand
wearacommerciallyavailabledischarging ESDwrist strap,
whichshouldremoveelectrostaticchargefor potential shock
reasonsprior toapplying powertotheunitundertest.
2. Afterremoving anelectrical assemblyequippedwithES devices,
place theassemblyon aconductivesurface suchas aluminum
foil, topreventelectrostaticchargebuildup or exposureofthe
assembly.
3. Use onlyagrounded-tipsoldering iron tosolderor unsolderES
devices.
4. Use onlyanantistaticsolderremoval device. Somesolder
removal devices notclassifiedas "antistatic(ESDprotected)"can
generate electrical chargesufficienttodamageES devices.
5. Donotuse freon-propelledchemicals. These cangenerate
electrical charges sufficienttodamageES devices.
6. DonotremoveareplacementES device from its protective
packageuntil immediatelybeforeyou arereadytoinstall it. (Most
replacementES devices arepackagedwithleadselectrically
shortedtogetherbyconductivefoam, aluminum foil or
comparableconductivematerial).
7. Immediatelybeforeremoving theprotectivematerial from the
leadsofareplacementES device, touchtheprotectivematerial to
thechassisor circuitassemblyintowhichthedevice will be
installed.
CAUTION:Besureno powerisappliedtothechassisor circuit,
and observeall othersafetyprecautions.

8. Minimizebodilymotionswhenhandling unpackagedreplacement
ES devices. (Otherwise harmless motion suchas thebrushing
togetherofyour clothes fabricor thelifting ofyour footfrom a
carpetedfloor cangenerate staticelectricity(ESD)sufficientto
damageanES device).
"NOTEto CATVsysteminstaller:
This reminderis providedto call the CATVsysteminstaller’s attention to Article 820-22 of the
NEC thatprovides guidelines forpropergrounding and, inparticular, specifies thatthe cable
ground shall be connectedto the grounding systemof the building, as close to the point of
cable entryas practical."
3. OPERATIONGUIDE
4. SERVICE NOTES (PLEASE READ)
4.1. SERVICE NOTES
4.1.1. SIMPLIFIEDFAULT FINDINGDATA
implifiedSelf-Diagnostic Systemfacilitates finding the cause of the fault. A3-digitfaultcode
will be displayedinF.I.P.
The SimplifiedFaultfinding data is storedinthe MemoryIC (IC6005). This data is clearedafterit
is displayed, and thenthe POWER button is pressedback on.
1. Withpowerturnedoff, press CH DOWNbutton on VCR (for over3
secondsifVCR isnotinshutoff condition).
Fig. 1-1
2. Faultcode(3-digitnumber)will bedisplayedinF.I.P. as shown.
Fig. 1-2
Fig. 1-3

Fig. 1-4
Fig. 1-5

3. When1to4listedinLock codeoccurs, Lock data will bestored
intheMemoryIC(latest Lock data only).
Note:
1. Lock data will bekeptaftertheACCord isunplugged.
2. When1to4listedinLock codeoccursfor thefirst time, theVCR
does notgo intoVCR shut-off condition. Ifitoccursagainwithina
minute, theVCR goes intoVCR shut-off condition. Then, theVCR
stopsand all VCR function buttonsexceptfor powerbecomenon-
operational.
3. Lock data will beclearedat thefirst poweron operation afterlock
codeisdisplayedinFIP.
4.1.2. USAGE SCREENMODE
Function displayedon the TVmonitor:
-thetotal elapsed”Cylinderrotation ”time(inhours)
1. Withpowerturnedon and no cassette, press CH DOWNbutton on
VCR and 7keyon remote together.
(TheUSAGE SCREENwill bedisplayedon theTV Monitor.)
Fig. 2

Note:
1. Afterreplacing theCylinderUnit, press COUNTERRESETbutton
on remote inthismode. Total elapsed"Cylinderrotation" time(in
hours) will beclearedto0.
2. Torelease from UsageScreenMode, press anyoperation button
on VCR or insertacassette tapeinthismode. TheVCR will return
tonormal operation mode.
4.1.3. EEPROM IC(IC6005), MAINC.B.A. REPLACEMENT NOTE
Afterreplacing EEPROMIC (IC6005)orMainC.B.A., be sure to performthe "PGSHIFTER
ADJUSTMENT"inELECTRICALADJUSTMENTprocedures.
4.1.4. SERVICEPOSITION
4.1.4.1. Service Position
CAUTION:
HOTCIRCUIT(Primarycircuit) exists on theMainC.B.A.
Use extremecaretopreventaccidental shock whenservicing.
4.1.4.1.1. Service Position (1)
Fig. 3-1
4.1.4.1.2. Service Position (2-1)
(Normal Frame Model)
Fig. 3-2-1

4.1.4.1.3. Service Position (2-2)
(Wide Frame Model)
Fig. 3-2-2
Note:
1. Itispossiblethat theS-TabSW. maynotworkcorrectlyinService
Position (2-1), (2-2). (Recording cannotbedone). Inthiscase,
shorttheS-TabSW. Pinson thefoil sideoftheMainC.B.A. toturn
thisSW. on. Fig. 3-3

2. Place thetapebetweentheCassette UpAss’yand MainC.B.A. to
get astability.
Fig. 3-4
4.1.5. HOT CIRCUIT
Primarycircuitexists on the MainC.B.A.
This circuitis identifiedas "HOT"on the C.B.A. and inthe Service Manual. Use extreme care to
prevent accidental shock whenservicing.
4.1.6. SERVICEMODE
Inorderto inhibitdetection of the Supply& Takeup Photo Transistors, Reel Sensor, and
CylinderLock, press and holdFF button and CH DOWN buttons on VCR togetherover5
seconds inpoweroff condition.
Fig. 4-1
The powercomes on and the unitgoes into service mode.
Inthis mode, Mechanismmovement canbe confirmed. Whenremoving Cassette UpAss’y, it
canbe confirmedwithout a cassette.

Torelease from this mode, press POWER button off ordisconnectAC Plug.
4.1.7. TRACKINGCENTERMODE(TRACKINGFIXAT CENTER)
Insertthe Cassette tape. Setthe unitinto Service Mode. Playback the Cassette tape. Press
PLAYbutton inPlayback mode. "TRACKINGCENTER"will be displayedon the TVmonitor.
Inthis mode, the tracking is fixedatcenter. (Auto tracking and manual tracking functions are
not operational.)
Fig. 4-2
Torelease from this mode, press PLAYorSTOPbutton.
4.1.8. CAUTIONFORINSTALLATIONOFFRONT PANELASS’Y
CAUTION:
OpenerLevermaybedamagedwhenFrontPanel Ass’yisinstalled,
withCassette Door-LidofFrontPanel Ass’yand OpenerLeverof
Cassette UpAss’yset incorrectly.
Install the Front Panel Ass’yas follows:
1. Swing theCassette Door-Lidall thewayopenuntil theCassette
Door tabclearstheOpenerLever.
2. Make surethat all locking tabsarealignedproperly. Then, press
theFrontPanel straightin.
Fig. 5

4.1.9. METHODFORLOADING/UNLOADINGOFMECHANISM
4.1.9.1. (Manual Method)
Turnthe Loading Gearclockwise (forloading) orcounterclockwise (forunloading) using
needlenose pliers etc.
Note:
Donotuse thismethod ifMechanismisjammedor locked.
Fig. 6-1
4.1.9.2. (Electrical Method)
Apply+10.0 VDC PowerSupplyto the Loading Motorterminals.
Loading
DC +to Portion "a,"DC -to Portion "b"
Unloading
DC -to Portion "a,"DC +to Portion "b"
CAUTION:
Beforeapplying DC PowerSupply, besuretocuttheMotor Leads
withacutter, etc.
Otherwise, theLoading Motor DriveIC(IC2501) maybedamaged.
Fig. 6-2

4.1.9.2.1. WHEN LOADINGWITHOUTACASSETTE
Whenloading without a cassette, pushPortion "a"on the HolderUnitof Cassette UpAss’yso
thatthe Leverclearthe FirstTaband Second Tab.
Fig. 6-3
4.1.10. HOWTOREMOVE AJAMMEDTAPE
CAUTION:
WiperArm Unitmaybedamagedor its spring maybeoutofplace
whenthejammedtapeisremovedbyforce.
Remove a jammedtape as follows:
4.1.10.1. Manual Method
Whena tape jamis encountered, check the tape loading condition and use the following
procedure to remove a tape jam.
Fig. 7-1
Method -1:
1. MovethePinchRollerUnitoutbyunhooking thePinofPinchArm
Unitsothat thePinchRollerisseparatedfrom theCapstanRotor
Unitshaft. Fig. 7-2

2. Removethetapefrom thetapepath.
3. Rewind thetapeintothecassette byrotating theCenterClutch
Unitcounterclockwise.
4. UnhookSpring (A)oftheDriveRack Arm.
5. RemoveScrew(A).
6. Lift theCassette UpAss’y. Whilepulling theCassette UpAss’y
outfarenough sothat itclearstheDriveRack Arm, slidetheDrive
Rack Unitas indicatedbythearrowtoremovethecassette tape
from theCassette UpAss’y.
7. Check thecause ofmechanical troubleand repair.
Fig. 7-3
Method -2:
1. Rotate Loading Motor counterclockwise withneedlenose pliers,
etc. sothat thePinchRollerisseparatedfrom theshaft ofthe
CapstanRotor Unit.
2. Perform Step2through Step7ofMethod -1.
Method -3:

1. Perform Step2through Step7ofMethod -1.
Note:
Afterrepairing mechanical trouble, make surethat all gear
alignments arecorrect, especiallytheWiperArm Unitand Drive
Rack UnitofCassette UpAss’y. (Referto"EJECT Position
Confirmation"inDISASSEMBLY/ASSEMBLY PROCEDURES.)
4.1.10.2. Electrical Method
Electrical method canonlybe performedwhenthe mechanismis movedbyrotating the
Loading Gear.
CAUTION:
1. Beforeapplying DC PowerSupply, besuretocuttheMotor Leads
withacutter, etc.
Otherwise, theLoading Motor DriveIC(IC2501) maybedamaged.
2. Ifloading does notstartinapprox. 2secondsafterDC Power
Supplyisapplied, DO NOTcontinuetoapplyDC PowerSupply.
Instead, perform "Manual Method."
1. BesuretocuttheMotor Leadswithacutter, etc.
2. Apply+10.0V DC PowerSupplytotheLoading Motor terminals.
3. WhentheLoading Posts reachthefullyunloadedposition,
removethePowerSupply. Fig. 8
4. Rewind thetapeintothecassette byturning theCenterClutch
Unitcounterclockwise.
5. Eject thecassette byapplying +10.0V DC PowerSupplyagain.

4.1.11. BLACK SCREWSONTHECHASSIS
Black Screws are usedon the MechanismChassis to identifyscrews thatrequire adjustment.
4.1.12. HOWTORESET ALL VCR MEMORYFUNCTIONS
Toreset(clear)the selectlanguage, channel auto setand setclock functions to theirinitial
poweron condition (poweron, no cassette inserted), holddownthe PLAYand CH UPbuttons
on the unittogetherformore than5 seconds.
Powerwill shut off.
4.1.13. HOWTOCONFIRM AUTOCLOCK SET FEATURE
1. Connect anRFcablefrom theoutputofoneunittotheinputof
thetest unit.
2. Select corresponding RFchannels.
3. Playback arecording ofP.B.S. channel including clock set data
and confirm thisfeature.
4.1.14. VARIABLEVOLTAGE ISOLATIONTRANSFORMER
AnIsolation Transformershouldalways be usedduring the servicing of VCR whose chassis is
not isolatedfrom the AC powerline. Use a transformerof adequate powerrating as this
protects the technicianfrom accidents resulting inpersonal injuryfrom electrical shocks. Itwill
alsoprotectVCR from being damagedbyaccidental shorting thatmayoccurduring servicing.
Also, whentroubleshooting the above type of PowerSupplyCircuit, a variable isolation
transformeris requiredinorderto increase the input voltage slowly.
4.1.15. SPECIALNOTE
All integratedcircuits and manyothersemiconductordevices are electrostaticallysensitive and
therefore require the special handling techniques describedunderthe
"ELECTROSTATICALLYSENSITIVE (ES)DEVICES" section of this service manual.
4.1.16. MODELNO. IDENTIFICATIONMARK
Use Marks showninthe chartbelowto distinguishthe different models includedinthis Service
Manual.
5. DISASSEMBLY/ASSEMBLY PROCEDURES
5.1. CABINETSECTION
5.1.1. DisassemblyMethod

Figure

5.1.1.1. Notes inchart
1. Installation ofTop Cover
Install theTop Coverfrontportion at adownward anglesothat
thetabon theFrontPanel Ass’yfits intotheholeintheTop Cover.
Then, lowertherearportion intoplace and tighten2Screws(447).
2. Installation ofFrontPanel Ass’y
CAUTION:

OpenerLevermaybedamagedwhenFrontPanel Ass’yis
installed, withCassette Door-LidofFrontPanel Ass’yand Opener
LeverofCassette UpAss’yset incorrectly.
A. Wheninstalling theFrontPanel Ass’y, swing theCassette Door-
Lidall thewayopenuntil theCassette Door tabclearsthe
OpenerLever.
B. Make surethat all locking tabsarealignedproperly.
Then, press theFrontPanel straightin.
Fig. D1
3. Installation ofMainC.B.A. &MechanismChassisontotheFrame
Wheninstalling 2Screws(460), slidetheHolderUnitofthe
Cassette UpAss’y(Referto"WHEN LOADING WITHOUT A
CASSETTE"inService Notes) totightenscrews. Then, slideit
back totheEJECTPosition.
4. Installation ofMechanismChassisand Cassette UpAss’yonto
MainC.B.A.
A. Make suretheModeSelect SW. on theMainC.B.A. isinEJECT
position. Ifnot, rotate theModeSelect SW. until thealignment
projection isintheEJECTPosition.
Fig. D2

B. Install theMechanismChassisand Cassette UpAss’ystraight
ontotheMainC.B.A. sothat theSensor LEDclearstheholein
theMechanismChassisand that 2Connectors(P4001, P6201)
arealignedand seatedsecurely.
5. Flat Cablesolderpoints on theCylinderand ACHead
SoldertheFlat Cables. Then, install theShieldPlate as shown.
Fig. D3
6. Installation ofCassette UpAss’y
A. Confirm that theLocking TabundertheCassette UpAss’yisin
Holeon theMechanismChassiswheninstalling theCassette
UpAss’y. Then, slidetheCassette UpAss’ytowardstheback.
B. Wheninstalling 2Screws(502), slidetheHolderUnit(Referto"
WHEN LOADING WITHOUT A CASSETTE"inService Notes) to
tightenscrews. Then, slideitback totheEJECTPosition.